Theory of Machine
In a cone pulley, if the sum of radii of the pulleys on the driving and driven shafts is constant, then

Crossed belt drive is recommended
Open belt drive is recommended
The drive is recommended depending upon the torque transmitted
Both open belt drive and crossed belt drive is recommended

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Theory of Machine
Oldham's coupling is the

Third inversion of slider crank chain
Second inversion of double slider crank chain
Second inversion of single slider crank chain
Third inversion of double slider crank chain

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